<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JS执行环境</title>
</head>
<body>
<input type="text" placeholder="请输入你的结果">
<button onclick="check()">验证</button>

<script>
    <button onclick="">删除</button>
    prompt  ("你好吗")

</script>





</body>
</html>